How old are the homes in Darby Township (Union County), OH?

Name: Age of homes in Darby Township (Union County), OH, 2020–2024
Creator: US Census Bureau
License: https://www.census.gov/data/developers/about/terms-of-service.html

46.9% (±12.6 points) of the homes in Darby Township (Union County), OH were built before 1980 (2020–2024 American Community Survey).

24.3% were built before 1940.

25.1% were built in 2010 or later.

Figures last updated on November 12, 2026.

Built before 1980: 46.9% (±12.6 points)
Built before 1940: 24.3%
Built 2010 or later: 25.1%

When the homes in Darby Township (Union County) were built

Housing units by year structure built, 2020–2024
Year built	Darby Township (Union County)	Union County	Ohio	United States
2020 or later	0.8% (±1.5 points)	5.7%	1.1%	2.0%
2010 to 2019	24.3% (±12.1 points)	18.6%	5.6%	9.4%
2000 to 2009	10.5% (±6.7 points)	19.4%	9.7%	13.6%
1990 to 1999	11.0% (±6.5 points)	15.2%	11.1%	12.4%
1980 to 1989	6.6% (±5.0 points)	5.5%	9.1%	12.9%
1970 to 1979	9.6% (±5.0 points)	10.8%	14.0%	14.2%
1960 to 1969	7.5% (±4.3 points)	3.6%	11.7%	9.9%
1950 to 1959	5.0% (±5.9 points)	4.2%	13.1%	9.5%
1940 to 1949	0.5% (±0.6 points)	2.1%	5.6%	4.4%
1939 or earlier	24.3% (±8.9 points)	14.8%	19.0%	11.7%

In Darby Township (Union County), the share of homes built before 1980 is not measurably different from Union County (35.5%).

It is also lower than in Ohio (63.4%).

It is not measurably different from the national figure (49.7%).

In Union County, Darby Township (Union County) ranks 12 of 21 places with a published estimate, from highest to lowest share of homes built before 1980.

Statewide, it ranks 1876 of 2,382.

Rankings use the estimates alone; where margins of error overlap, neighboring ranks may not truly differ.

Why the age of a home matters: lead-based paint

Federal law treats housing built before 1978 as likely to contain lead-based paint.

Before a lease or sale of most pre-1978 housing, the landlord or seller must disclose any known lead-based paint and hazards and give the tenant or buyer the EPA pamphlet (42 U.S.C. § 4852d; 40 CFR part 745, subpart F; 24 CFR part 35, subpart A).

A contractor paid to renovate, repair or paint a pre-1978 home must be a certified firm, use a certified renovator and follow lead-safe work practices under the Renovation, Repair and Painting Rule (40 CFR part 745, subpart E) whenever the job disturbs more than 6 square feet of painted surface in a room or more than 20 square feet outside; window replacement and demolition always count (40 CFR 745.83).

Certification comes from EPA, or from the state where EPA has authorized the state to run the program.

The Census Bureau groups construction by decade, so the share built before 1978 lies between the share built before 1970 (37.3%) and the share built before 1980 (46.9%).

Homes built before 1980 in places near Darby Township (Union County)

Nearest places with a published estimate, compared with Darby Township (Union County)
Place	Distance	Homes built before 1980	Compared with this place
Darby Township (Union County)	—	46.9% (±12.6 points)	—
Unionville Center	1.2 mi	73.5% (±29.2 points)	Not measurably different
Plain City	4.8 mi	38.6% (±10.2 points)	Not measurably different
Darby Township (Madison County)	4.9 mi	28.9% (±10.2 points)	Lower
Union Township (Union County)	5.2 mi	65.2% (±13.7 points)	Not measurably different
Marysville	5.2 mi	30.2% (±4.5 points)	Lower
New California	5.5 mi	11.2% (±12.8 points)	Lower
Jerome Township	5.5 mi	18.4% (±5.0 points)	Lower
Milford Center	5.5 mi	69.6% (±13.2 points)	Higher

Nearby places with a measurably lower figure: Darby Township (Madison County), OH (28.9%), Marysville, OH (30.2%), New California, OH (11.2%).

Nearby places with a measurably higher figure: Milford Center, OH (69.6%).

Distance is measured in a straight line between the Census Bureau’s internal points for each place.

Homes built before 1980 across Union County, place by place

Rank	Place	Homes built before 1980
6	Union Township (Union County)	65.2% (±13.7 points)
7	Leesburg Township	61.8% (±14.2 points)
8	Jackson Township (Union County)	60.1% (±26.2 points)
9	Washington Township (Union County, township, 81662)	59.7% (±35.3 points)
10	Dover Township (Union County)	55.4% (±14.7 points)
11	Millcreek Township	51.4% (±22.8 points)
12	Darby Township (Union County)	46.9% (±12.6 points)
13	Taylor Township	45.1% (±13.6 points)
14	Liberty Township (Union County)	42.2% (±12.8 points)
15	Allen Township (Union County)	33.7% (±14.9 points)
16	Paris Township (Union County)	31.3% (±4.3 points)
17	Marysville	30.2% (±4.5 points)
18	York Township (Union County)	23.4% (±16.4 points)

Showing 13 of 21 places in Union County, ranked from highest to lowest.

Survey years: 2020–2024 (American Community Survey 5-year estimates).

Margins of error are at the 90% confidence level.

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Questions about Darby Township (Union County)

How old are most homes in Darby Township (Union County)?

46.9% of homes in Darby Township (Union County), OH were built before 1980 (2020–2024 American Community Survey).

Do homes in Darby Township (Union County) need a lead paint disclosure?

A home built before 1978 does, before it is rented or sold, unless an exemption applies (42 U.S.C. § 4852d); between 37.3% and 46.9% of homes in Darby Township (Union County) were built before then.

Does a contractor need lead certification to work on older homes in Darby Township (Union County)?

Yes, when the job disturbs more than 6 square feet of paint in a room or 20 square feet outside, or replaces a window: the firm must be certified and a certified renovator must direct the work under the Renovation, Repair and Painting Rule (40 CFR part 745, subpart E).

Sources

Selected Housing Characteristics (DP04), 2020–2024 ACS 5-year estimates — Darby township, Union County, Ohio

To check these figures in the Census Bureau’s own API, request the variables below from the 2024 ACS 5-year data profile (acs/acs5/profile) for Darby township, Union County, Ohio (county subdivision:20170, in state:39 county:159).

Each estimate (E or PE) has a margin of error beside it (M or PM).

The API needs a free key.

Request a Census API key.

DP04_0017PE, DP04_0017PM, DP04_0018PE, DP04_0018PM, DP04_0019PE, DP04_0019PM, DP04_0020PE, DP04_0020PM, DP04_0021PE, DP04_0021PM, DP04_0022PE, DP04_0022PM, DP04_0023PE, DP04_0023PM, DP04_0024PE, DP04_0024PM, DP04_0025PE, DP04_0025PM, DP04_0026PE, DP04_0026PM

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Figures are published by the US Census Bureau, HUD, the Bureau of Labor Statistics and the FBI; Seayora reproduces them and does not adjust them, except where a sentence says it compares dollar figures after inflation. They describe the whole place, not any one building or street, and are not an appraisal, a rent determination, a tax bill, a safety rating or legal advice.